Ogbe (1972) further modified this and proposed a fourth unit, which he said is Paleocene in age and associated with shallow marine environment due to abundance of coralline algae, gastropods, pelecypods, echinoid fragments and other skeletal debris.

The red sea urchin, Strongylocentrotus franciscanus, is the largest echinoid in kelp forest communities along the west coast of North America and is fished commercially from British Columbia to Baja California (Sloan, 1986).

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